Physics – Condensed Matter – Materials Science
Scientific paper
2005-11-16
Phys. Rev. Lett. 97, 267203 (2006)
Physics
Condensed Matter
Materials Science
5 pages, 4 figures
Scientific paper
Despite the availability of a spin Hamiltonian for the Gd3Ga5O12 garnet (GGG) for over twenty five years, there has so far been little theoretical insight regarding the many unusual low temperature properties of GGG. Here we investigate GGG in zero magnetic field using mean-field theory. We reproduce the spin liquid-like correlations and, most importantly, explain the positions of the sharp peaks seen in powder neutron diffraction experiments. We show that it is crucial to treat accurately the long-range nature of the magnetic dipolar interactions to allow for a determination of the small exchange energy scales involved in the selection of the experimental ordering wave vector. Our results show that the incommensurate order in GGG is classical in nature, intrinsic to the microscopic spin Hamiltonian and not caused by weak disorder.
Enjalran Matthew
Gingras Michel J. -P.
Yavors'kii Taras
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